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Finding the Fourth Proportional to 420,648.32, 580,486.80 and 239,356.16

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Solution

The fourth proportional to 420,648.32, 580,486.80 and 239,356.16 is: 330,307.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,648.32 : 580,486.80 = 239,356.16 : x
  2. Step 2: Convert to fraction form
    420,648.32/580,486.80 = 239,356.16/x
  3. Step 3: Cross multiply
    420,648.32x = 580,486.80 × 239,356.16
  4. Step 4: Simplify right side
    420,648.32x = 138,943,091,378.69
  5. Step 5: Solve for x
    x = 138,943,091,378.69/420,648.32
  6. Step 6: Final answer
    x = 330,307.02

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.